Loss of Power / Hesitation – Common Codes

Hesitation or loss of power under acceleration is often lean conditions, MAF issues, misfires, or (on turbo cars) underboost.

What To Do Next

Read codes and monitor fuel trims and MAF readings. Check for boost leaks on turbo engines. Do not ignore misfire codes.

Practical Tips

Does it happen only when warm or under load?
Any recent air filter or MAF cleaning?
Turbo models: inspect intercooler hoses for cracks.

Common Related Codes

These codes frequently appear with this symptom. Click for causes, cost estimates and repair steps.

Code Description Severity
P0300 Random/Multiple Cylinder Misfire Detected High
P0171 System Too Lean (Bank 1) Med
P0101 Mass or Volume Air Flow Circuit Range/Performance Med
P0299 Turbocharger/Supercharger Underboost High
P0087 Fuel Rail/System Pressure Too Low High
P0121 Throttle/Pedal Position Sensor A Circuit Range/Performance Med

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